Table 3.

Odds for having surgery according to BMI, age, gender, onset of obesity, and weight-related comorbidities

Explanatory variables	Model 1	p value	Model 2	p value	Model 3	p value	Model 4	p value	Model 5	p value
	OR (95% CI)		OR (95% CI)		OR (95% CI)		OR (95% CI)		OR (95% CI)
BMI
<40.0 kg/m2	1		1		1		1		1
40.0–49.9 kg/m2	3.05 (1.90–4.90)	<0.001	3.15 (1.95–5.10)	<0.001	3.07 (1.89–4.99)	<0.001	3.02 (1.85–4.91)	<0.001	3.12 (1.91–5.07)	<0.001
≥50.0 kg/m2	6.07 (3.25–11.32)	<0.001	6.33 (3.36–11.94)	<0.001	5.88 (3.08–11.25)	<0.001	5.73 (3.00–10.99)	<0.001	5.86 (3.01–11.22)	<0.001
Age			0.98 (0.96–0.99)	0.003	0.98 (0.97–1.00)	0.064	0.98 (0.96–1.00)	0.022	0.98 (0.96–1.00)	0.022
Gender			0.75 (0.50–1.12)	0.152	0.71 (0.47–1.10)	0.095	0.68 (0.45–1.03)	0.068	0.69 (0.46–1.05)	0.082
Age at onset of obesity
>20 years					1	0.135	1	0.125	1	0.148
<12 years					1.59 (1.00–2.52)	0.051	1.61 (1.01–2.57)	0.044	1.59 (0.99–2.49)	0.057
12–20 years					1.36 (0.83–2.23)	0.223	1.35 (0.82–2.21)	0.242	1.36 (0.83–2.05)	0.221
Weight-related comorbidities							1.16 (0.99–1.40)	0.107
Type 2 diabetes									1.28 (0.80–2.05)	0.303

Model 1 BMI as explanatory variable in the logistic regression model, model 2 explanatory variables as in model 1 plus age and gender, model 3 explanatory variables as in model 2 plus age at onset of obesity, model 4 explanatory variables as in model 3 plus sum of weight-related comorbidities as a continuous variable (type 2 diabetes, yes = 1, no = 0; hypertension, yes = 1, no = 0; obstructive sleep apnea, yes = 1, no = 0; dyslipidemia, yes = 1, no = 0; and joint pain, yes=1, no = 0), model 5 explanatory variables as in model 3 plus type 2 diabetes